Which proportion could be used to find the length of side b?

Answer:
C
Step-by-step explanation:
Using the Sine rule in Δ ABC
Calculate the measure of ∠ C
∠ C = 180° - (64 + 85)° = 180° - 149° = 31° , then
[tex]\frac{sin31}{9.3}[/tex] = [tex]\frac{sin85}{b}[/tex] → C